ctf_add_forward
mcpu = ctf_add_forward(fp, CTF_ADD_NONROOT, "machcpu",
dst_type = ctf_add_forward(dst_fp,
base = ctf_add_forward(cup->cu_ctfp, isroot, name, kind);
ret = ctf_add_forward(cmp->cm_out, flags, name, kind);
type = ctf_add_forward(dmp->dm_ctfp, flag,
extern ctf_id_t ctf_add_forward(ctf_file_t *, uint_t, const char *, uint_t);